<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script type="text/javascript" >
    
    let p =new Promise(()=>{})
    async function fn1(){
        await p
        console.log('hello');
    }
    fn1()
    </script>
</body>
</html>